Most cards are quickly identified by the presence of the "Old Judge" advertising on the front of the card. The backs are blank. Among collectors, there have been certain cards that have been modified to remove the photo from the backing due to damage and were restored. This process is known as "skinning, " while a card that has had its cardboard backing replaced is called a "rebacked" card. These are acceptable among some (but not all) collectors, as long as they are divulged to have been done.